Well, you do have a point that Reason - when used to its full potential - expects people to understand the signal flow, audio concepts and welcomes real-life hardware experience.
But at the same time you don't have to understand any of it if you are - like that guy claimed to be - "just" a musican. In that case you just drop instruments, sounds and FX on a track, arm recording and off you go. And even when we're talking about sidechianing, I'd argue that Reason's way should be easier for "just" a musician to understand, because it involves actualy chaining a signal from one place to another (it's in the name, for God's sakes!) to trigger a compressor. I mean ins/outs & cables are not a foreign concept, unless all one ever did is played flute in the middle of the forest... The way most DAWs totally abstract that via drop-down menus is only intuitive to computer geeks.
In the end such a discussion is obviously pointless, as there will be fans of both approaches and anyone can learn the other in couple of minutes. It's just a matter of wanting to understand the principle and the general paradigm of the DAW and deciding whether it's for you or not.